Postage rates

I've just heard that postage rates will go up again on May 12, from 41 to 42 cents. Most of my submissions to literary journal require a self-addressed, stamped envelope (SASE) for them to send me my rejection letter. I have of late been affixing all my old 37 and 39 cent stamps, with the addition of the appropriate number of 2 cent stamps. It occurs to me now, that with the 3-6 month turn-around that many of these journals have, by the time they send me my SASE, it will be 1 cent short. I'm now switching to "Forever" stamps.